The Meteorological Department on Sunday issued a "heavy to very heavy rain over Thailand" warning from today until tomorrow.

The department announced that the intense monsoon trough lying across the Central, East and Lower Northeast and the strong southwest monsoon prevailing over the Andaman Sea, the South and the Gulf of Thailand are likely to cause torrential rain and isolated heavy to very heavy rail falls much of the country.

People in risky areas along foothills and waterways are warned of possible flash floods.

People in lowlands and riversides in the Central and the East are warned of overflow.

The strong wind-wave in the Andaman Sea and the upper Gulf of Thailand is likely 2-3m high. All ships should proceed with caution and small boats keep ashore during one to two days.

The Disasters Relief and Mitigation Department, meanwhile, reported that 69 provinces in 16 provinces are still hit with flooding which has claimed 80 lives and six missing. The highest death toll, 23, is in Phichit province.